Pinking cutter



H. B. RUDD PINKING CUTTERS May 5, 1942.

Filed Oct. 22,A 1940 YPatented May 5, 1942 PINKING CUTTER Harry B. Rudd, Flushing, N. Y.

Application October 22, 1940, Serial No. 362,187

13 Claims. (Cl. 30-230) The present invention relatesto new and useful improvements in pinking cutters and more particularly to an improved manually operated device for pinking the edge of textile material.

Objects and advantages of the invention will be set forth in part hereinafter and in part will` modifications of the invention, andtogether with the description, serves to explain the pxiinciples of the invention.

Of the drawing: y Figure 1 is a side elevation of a typical and illustrative embodiment of the present invention;

Figure 2 is a bottom plan view of the upper portion of/ the pinking cutter, carryingthe cutting member; f

Figure 3 is a top plan view ofthe lower member of the pinking cutter which cooperates with the cutting blade; H

Figure 4 is a vertical section takn on the line 4-4 of Figure 1;

Figure 5is a fragmentary detailed side elevation of-a cutting blade or knife used in connec- V tion with the embodiment of Figure 1;

Figure 6 is a bottom plan view, with parts broke away, of a modified form of cutting member;

igure 7 is a sectional view taken on the line 1-1 of Figure'; and l I Figure 8 is a detailed side `levation of one o! the elements of the cutting knife used in connection with the modication of Figures 6 and 7.

The present invention hasy for its object the provision of a novel and improved pinking cutter particularly adapted for manual operation. A further object' of the invention is the provision Aof a manually operated pinking cutter which is simple in construction, relatively inexpensive, and in which the cutting members may be easily replaced in case they become dull. Still another object of the invention is the provision of an improved apparatus for pinking textile material which does not require the use of accurately ground cooperating parts, and in which the cut- .Y ting members are easily replaceable at a minimum of expense. I

Referring now in detail to -thy typical and 1l- /ed into a registerin lustrative embodiment of the invention as shown in Figures 1 to 5 of the accompanying drawing, the pinking cutters are shown as formed to resemble a pair of scissors, and the lower member I0 and upper member II are provided with ilat portions I2 and I4 through which passes a pivot screw I5. with the thumb loop I6 and adjacent it the other member II is provided with a finger loop I1, by which the members may be pivotally moved toward and away from each other in themanner of an ordinary pair of scissors.

The upper member II is provided with a zigzag cutting blade 20 which is shown in detail in Figure 5, and this cutting member or knife comprises a plurality of interconnected sections 2l each of which are straight, relatively short, `and may be formed by bending a long narrow strip of suitable metal. Along one `edge the portions 2I are pointed, as at 22, and are ground to provide two cutting edges 23 and 24 preferably being ex- 24 diverging from the central points A22 V'andy meeting at the bends 26 in the blade 2U.

I find that although other forms ofjcutting.

edges may be employed, the provision of the cen/ trally arranged line of cutting points l22 isan advantage, as the points pierce through the mate,-

. rial to be cut and there is no tendencygof the cut material to gather into thegplade', as is sometimes experienced withfother forms'bf cutting edge.

Means are provided for securely and accurately positioning and holding the cutting blade 20 in the cutter member II and for this purpose the member II is preferably formed, as two longitudinally extending yportions 30 and 3I which are provided on their adjacent sides with a plurality of interfitting teeth 32, the shape, size and spacing of these teeth 32 accurately lcorresponding with the zigzag portions of the cutting blade 20. Preferably, the portions 30 and 3I are resilient, and tend to spring away from each other, their outer ends 34, 35 being held together by means of a small clampinggscrew 3B, which is passed through an aperture n' the end 34 and is threadafl/aperture in the end 35, so that as the member/s 30 yand 3| are clamped together by a screw 36 after a blade 20 has been At one end the member I0 is provided I positionedbetween the interiltting teeth 32, the blade 20 is securely andaccurately h'eld in a denite position with respect to the member II andthe pivot I5. In order to increase the resiliency of the members 30 and 3I-,. the ends of these members closest to the"pivot I5 are preierably cut away to provide an open space 39.

The lower member. I of the cutter comprises a plate 36 extending the length of the member. and strengthened by means of its channel-like sides 31. Plate 36 is slotted to receive and accurately register with the cutting edge of blade 20, and l'or this purpose it is provided with a plurality of narrow slots 38 extending through the plate 38, and these slots are interconnected to form a zigzag slot extending the length of the plate 35, the zigzag being of the same size and shape as'the cutting edge of blade 210, and being so positioned with reference thereto and the pivot I that accurate register ofthe cutting edge of blade 20 with the slots 38 is asportions of members I0 and II, near their pivot I5, a guard-ispreferably provided between the cutting blade 20 and the pivot I5, and comprises anarcuate bar 40 concentric with the pivot I5 and mounted in the upper member Il, passing freely through a registering aperture 42 in the upper plate 36 oi member I0.

Figure 4'of the drawing shows the cutter 20 about to enter the slot 38, and as will be observed from this ligure, the material between the members I0 and II is first pierced by the point 22 after which it is cut by the edges 23 and 24 which easily pass through the material but tend to spread the material away from the point 22.

In the use of the pinking cutters, the person grasps them by means of the loops I6 and I1 in the manner of a pair oi scissors, and oscillates the blades I Il and Il toward and from each other, forcing the. cutting blade 20 through the material to be cut and into the slots 38, which closely ilt the zigzag edge of the cutter. The cutters may be moved along through the material, producing a pinked edge, and the cutting action is facilitated by reason of the fact that although all the points 22 and the cutting edges ment of the members I0 and II towards each other.

When the cutter knife 20 becomes dull through long use, a new cutter 20 may be substituted merely by loosening the screw 36, allowing the portions 30 and 3| to spring awayl from each other, thereby releasing the knife 20, and a new knife may be inserted and accurately clamped by means of the screw 36.

Figures 6 to 8 illustrate a modied embodiment'ofthe invention in which the upper :member Il is formed of a pair of longitudinally extending channel-like members 50 which are attached to the pivoting portion l2 by means of a shank 5| and receive between them a cutter knife assembly 52 which is securely and accurately held invproper registering relation with respect to the slots 38 and the pivot I 5 by means of a screw 53 passing through the channels 50 near their outer ends, as well as through a registering aperture in the outer end of the assembly 52. Preferably the cutter bar assembly 52 is formed of a plurality of short blades 54, each provided with a cutting point 55 and cutting edges 56 and 51, and theseblades 54 are assembled and securely held in zigzagrelation, properly spaced with respect to the slots 38, by being embedded at their bases in a slightly wider block of thermo-plastic material 60 such as Bakelite or lead. The blade assembly 52 may be replaced by removal of the screw53, which permits the assembly 52 to be slipped out and a new one slid into place.

The invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chiel advantages.

What I claim is:

1. In a pair of pinking cutters, the combination of a pair oi' angularly movable members pivoted on each other, a thin zigzag cutting knife releasably carried by one of the members, means for accurately positioning the knife with respect to the member -by which it is carried, said other member being provided with narrow slots arranged zigzag and in registering relation to the y knife.

2. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, a thin zigzag cutting knife carried by one of the members and registering with and closely tting into zigzag slots in the other member, and handles .connected to the movable members for pivotally moving the members into and out of cutting relation.

3. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, a thin zigzag cutting knife carried by one of the members `and registering with and closely fitting into zigzag slots in the other member and a guard keeping material away from the pivot of the members and comprising an arcuate bar mounted on one member between the cutting knife and the pivot and an aperture in the other member to receive the arcuate bar.

4. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, a thin zigzag cutting knife carried by one of the members and comprising a plurality of short angularly arranged sections each having a sharply pointed portion, with the points arranged along a line centrally with respect to the knife carrying' member, said other member being provided with a zigzag slot of naricrilvivf width closely fitting the cutting edge of the 5. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, a thin zigzag cutting knife carried by one of the members and comprising a plurality of short angularly arranged sections each having a sharply pointed portion, said other member being provided with a zigzag slot of narrow width closely fitting the cutting edge of the knife.

6. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, one of said members conrprising a pair of longitudinally extending bars spaced -to receive a cutting member between them, said cutting members having a zigzag knife-cutting edge, the other of said movable members being provided with zigzag slots registering with and closely fitting the cutting edge when the members are moved together.

7. In a pair of pinking cutters.y the combination of a pair of angularly movable members pivoted on each other, one of said members cornprising a pair of longitudinally extending bars resiliently tending to spring apart, said bars having interfitting serrated edges, and being adapted to receive a zigzag knife cutting blade between them, said cutting member having sharp points on each of its short straight sections, said points being arrangedin line centrally of the resilient bars, means for clamping said bars together against their resilient action to firmly grip the blade and the other member being provided with a zigzag slot which is relatively narrow to closely t and register with the cutting edge of the knife blade.

8. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, one of said members comprising a pair of longitudinally extending bars resiliently tending to spring apart, said bars being adapted to receive a zigzag knife cutting blade between them, said cutting member having sharp points on each of its short straight sections, said points being arranged in line centrally of the resilient bars, means for clamping said bars together against their resilient action to firmly grip the blade and the other member being provided with a zigzag slot which is relatively narrow to closely fit and register with the cutting edge of the knife blade. l

9. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, one of said members comprising a pair of longitudinally extending bars resiliently tending to spring apart, said bars having interfltting serrated edges, and being adapted to receive a zigzag knife cutting blade between them, means for clamping said bars together against their resilient action to firmly grip the blade and the other member being provided with a zigzag slot which is relatively narrow to closely fit and register with the cutting edge of the knife blade.

10. In a pair of pinking cutters, the combination of a pair of angularly movable members pivoted on each other, one of said members cornprising a pair of longitudinally extending bars resiliently tending to spring apart, said bars being adapted to receive a zigzag knife cutting blade between them, means for clamping said bars together against their resilient action to firmly grip the blade and the other member being provided with a zigzag slot which is relatively narrow to closely fit and register with the cutting edge of the knife blade.

11. In a pair of pinking cutters the combination of a pair of pivoted members, a cutting knife having a wider base, one of said members being channeled to receive the base of said knife, means for locking the knife between said channels, the other of said members being provided with' a narrow zigzag slot to t closely and register with the cutting edge of the knife as the members are brought together.

12. In a pair of pinking cutters, the combination of a pair of pivoted members, handles for pivotally moving the members, each of said members being provided with a zigzag slot for a substantial portion of their length, a removable zigzag cutter blade fast in the slot in one member and movable into the slot in the other member for cutting material between the members.

13. In a pair of pinking cutters, the combination of a pair of pivoted members having handles at one end thereof, a zigzag cutting knife carried by one of the members registering with narrow slots in the other member, said knife being formed with pointed portions along its cutting edge.

HARRY B. RUDD. 

